Easton, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.9 °C (low) to 9.7 °C (high). Annual precipitation averages 1088.1 Millimeters. Easton is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.2 °C | -6.6 °C | 88.39 mm |
| February | -15.8 °C | -4.9 °C | 63.75 mm |
| March | -9.8 °C | 0.4 °C | 75.18 mm |
| April | -2.1 °C | 8.2 °C | 80.77 mm |
| May | 4.9 °C | 16.7 °C | 89.92 mm |
| June | 10.2 °C | 21.8 °C | 106.43 mm |
| July | 13.2 °C | 24.5 °C | 105.92 mm |
| August | 12 °C | 23.9 °C | 94.74 mm |
| September | 7.6 °C | 19.4 °C | 90.42 mm |
| October | 1.8 °C | 11.7 °C | 108.71 mm |
| November | -3.9 °C | 3.8 °C | 89.15 mm |
| December | -11.6 °C | -2.8 °C | 94.74 mm |
| Annual | -0.9 °C | 9.7 °C | 1088.12 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |